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Finding the Fourth Proportional to 784.28, 1,175.88 and 419

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Solution

The fourth proportional to 784.28, 1,175.88 and 419 is: 628.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.28 : 1,175.88 = 419 : x
  2. Step 2: Convert to fraction form
    784.28/1,175.88 = 419/x
  3. Step 3: Cross multiply
    784.28x = 1,175.88 × 419
  4. Step 4: Simplify right side
    784.28x = 492,693.72
  5. Step 5: Solve for x
    x = 492,693.72/784.28
  6. Step 6: Final answer
    x = 628.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.